Sounds like when it rains it pours for ya.
Ditto on the UIM R &R if you plan to keep the car (which you should). Its a real straight foward job that can be done with basic tools. The plastic elbow is a commom part to break and again, easy to find. Too bad the chunk fell into the manifold but you should go hunting for it. Everyone here seems to like the GM gaskets for the UIM and LIM fix. If the AC compressor locks up, you will lose your new belt and be dead in the water, again.
If you funding is short to replace the compressor, (as mine is) you can get a "compressor delete pulley". You remove the compressor and install the pulley in its place, another easy job which I just finished. While I drive an Olds 88, everyone here has been very helpful and will share their knowledge freely.